85 Sub 1 ton 454 engine swap and tailgate to barn door swap.

My friend who don't have access is doing an engine swap in his garage. He bought a 95 long block, and wants to drop it in his 85 sub. He also wants to see if he can swap the tailgate for barn doors. After much reading both here and on other sites, I have decided to post my thread here. We need straight answers and this site has the best feedback I have seen. We have a 95 TBI engine, minus everything but an alternator and intake. He wants to add all the stuff off the original 85 carb motor to it, and drop it in the sub. Any help here would be highly appreciated.
Brian L.